Should fire be coming out carburator with the air disconected when im trying to start it

It sounds like it's not getting any fire ?????? Did you pull a plug wire or better yet pull the coil wire ti the dist. does it have spark ? Not fire spark !
Ive replaced the Sensoers/MAP, TEMPERATURE, AIR, & the DISTIBUTOR CAP & IGNITION COIL, WIRES, COIL & Im Still Not Getting FIRE!! Sounds like you should have it towed to a qualified repair shop.

Do a compression test when the engine is cold. You may have a leaky valve or a lifter holding the valve slightly open when cold.

Bad manifold gasket or the manifold needs to be tightened down basically an exhaust leak

Probably they lifters are sticking causing timing and firing problems.... I had the same issues and after cleaning all the build up off the valve stems, lifters, and everything, put it back together with a new valve cover gasket it ran great.....

look at ur old lifters u may have a flat,burnt or bad spot on cam also check valves may be carboned, burnt or even slight bend and push rods same can be clogged ,bent etc,it does take a few to prime lifters- usually u can prime them before install with an oil can

Who changed what & why?

The PCM?

What was the original problem?

What codes going back a couple months?

I would look into fuel pressure.

it sounds like the valve lifter may have collapsed try an engine flush if this doesnt help you will have to replace the lifters

From the info you provided, it seems like it is not getting constant supply of fuel. I think that don't have a carburator. It has a TBI(Throttle Body Injector. You should hear a faint humming noise at the back coming from within the fuel tank when you turn the key on. Thats the fuel pump. Your fuel pump may have gone out.

if timming marks were set correctly and it is single cam engine were lifters bleed out before assembly? it may not have any compression
may have to remove top rocker cover only and use lever to push down on rockers to there is clearance between cam